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<p>Lion&rsquo;s Mane jellyfish&nbsp;have been spotted on Irish beaches forcing the possible cancelation of an Ironman event in Sandycove.</p>

<p>The organisers tweeted that&nbsp;they &quot;are aware of the jellyfish situation in Sandycove&quot;.</p>

<p>&ldquo;Athlete safety is paramount. We will continue to monitor and take action if necessary&quot;, they added.</p>

<p>A warning was issued by D&uacute;n Laoghaire-Rathdown County Council earlier this week.</p>

<p>&ldquo;We have raised the red warning flag in Sandycove and erected signs warning swimmers of the presence of jellyfish in the water and washed up on the beach,&rdquo; it said.</p>

<blockquote>
<p>&quot;Bathers are advised not to enter the water due to the presence of these jellyfish whose sting can be dangerous and cause serious symptoms including nausea, vomiting and respiratory distress.&quot;</p>
</blockquote>

<p>A Portuguese Man O&#39;War jellyfish was also found by lifeguards yesterday afternoon at Ballybunion beach, Co Kerry.&nbsp;Stings from either jellyfish can cause blisters, irritation, cramps and in some serious cases may even affect respiratory and heart function.</p>

<p>People are urged to seek medical attention if a sting&nbsp;results in anything other than mild discomfort.</p>

<p>The return of the summer weather this weekend will encourage plenty of people to go to the beach.</p>

<p>Sunday and Monday appear at this stage to be the best days to plan any outdoor activities with warm&nbsp;dry weather,&nbsp;good sunny spells and high temperatures of 20 to 23 degrees.</p>

<p>&nbsp;</p>

<blockquote class="twitter-tweet" data-lang="en">
<p dir="ltr" lang="en">Bathers,pls only swim in identified bathing areas that are lifeguarded &amp; ask them for info about possible jellyfish <a href="https://t.co/zL4aId2r7K">pic.twitter.com/zL4aId2r7K</a></p>
&mdash; FingalCountyCouncil (@Fingalcoco) <a href="https://twitter.com/Fingalcoco/status/764031199740174338">August 12, 2016</a></blockquote>
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<p>&nbsp;</p>

<blockquote class="twitter-tweet" data-lang="en">
<p dir="ltr" lang="en">WARNING - JELLYFISH Be extremely vigilant for dangerous Lion&#39;s Mane jellyfish at our beaches <a href="https://t.co/dagHEt5wXi">pic.twitter.com/dagHEt5wXi</a></p>
&mdash; Meath County Council (@meathcoco) <a href="https://twitter.com/meathcoco/status/763045580306321412">August 9, 2016</a></blockquote>
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<p>&nbsp;</p>

<blockquote class="twitter-tweet" data-lang="en">
<p dir="ltr" lang="en">Warning! Jellyfish in Sandycove <a href="https://t.co/kLS1QZusZt">https://t.co/kLS1QZusZt</a> <a href="https://t.co/xQ244ZU5Wx">pic.twitter.com/xQ244ZU5Wx</a></p>
&mdash; dlrcc (@dlrcc) <a href="https://twitter.com/dlrcc/status/763405118633078785">August 10, 2016</a></blockquote>
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